Java Utililty Methods Collection Combine

List of utility methods to do Collection Combine

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Description

The list of methods to do Collection Combine are organized into topic(s).

Method

StringcombineNames(Collection items)
combine Names 
if ((items == null) || (items.isEmpty())) {
    return "";
if (items.size() == 1) {
    Object item = items.iterator().next();
    return item == null ? "" : item.toString();
StringBuilder rval = new StringBuilder();
...
StringcombineProblemMessages(final Collection problems)
combine Problem Messages 
final StringBuilder builder = new StringBuilder("The following problems were found:\n\n");
for (final String problem : problems) {
    builder.append(problem).append("\n");
return builder.toString();
StringcombineString(Collection vec, String sep)
combine String 
if ((null == vec) || (null == sep)) {
    return null;
StringBuilder sb = new StringBuilder();
boolean first = true;
for (String part : vec) {
    if (first) {
        first = false;
...
StringcombineValues(Collection values)
One of a pair of methods (the other is splitValues) that is used to combine several un-encoded values into a single delimited, encoded value for placement into a hidden field. 
if (values == null || values.size() == 0) {
    return "";
} else {
    StringBuilder builder = new StringBuilder(values.size() * 30);
    for (String value : values) {
        builder.append(value).append(FIELD_DELIMITER_STRING);
    return encode(builder.toString());
...